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Assume you are a web designer, create an HTML layout using CSS classes.

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<div class="container">
  <div class="row">
    <div class="col-md-6">
      <div class="main-content">
        <!-- main content goes here -->
      </div>
    </div>
    <div class="col-md-6 sidebar-container">
      <div class="sidebar-content">
        <!-- sidebar content goes here -->
      </div>
    </div>
  </div>
</div>